r161 - community/trunk/en-US

[sradvan at fedoraproject.org]

Author: sradvan
Date: 2010-07-21 01:51:15 +0000 (Wed, 21 Jul 2010)
New Revision: 161

Modified:
   community/trunk/en-US/Communication.xml
Log:
fix sectid entries and plan out rf behavior sections

Modified: community/trunk/en-US/Communication.xml
===================================================================
--- community/trunk/en-US/Communication.xml	2010-07-17 20:06:23 UTC (rev 160)
+++ community/trunk/en-US/Communication.xml	2010-07-21 01:51:15 UTC (rev 161)
@@ -4,7 +4,43 @@
 
 <chapter id="chap-Wireless_Guide-Communication">
         <title>Wireless Communication</title>
-<section id="sect-Wireless_Guide-Hardware-Data_Rates_and_Throughput">
+<section id="sect-Wireless_Guide-Communication-RF_Behavior">
+<title>RF Behavior</title>
+			<para>
+				This section...
+			</para>
+<section id="sect-Wireless_Guide-Communication-RF_Behavior-Reflection">
+<title>Reflection</title>
+			<para>
+				Reflection
+			</para>
+</section>
+<section id="sect-Wireless_Guide-Communication-RF_Behavior-Absorption">
+<title>Absorption</title>
+			<para>
+				Absorption
+			</para>
+</section>
+<section id="sect-Wireless_Guide-Communication-RF_Behavior-Refraction">
+<title>Refraction</title>
+			<para>
+				Refraction
+			</para>
+</section>
+<section id="sect-Wireless_Guide-Communication-RF_Behavior-Scattering">
+<title>Scattering</title>
+			<para>
+				Scattering
+			</para>
+</section>
+<section id="sect-Wireless_Guide-Communication-RF_Behavior-Diffraction">
+<title>Diffraction</title>
+			<para>
+				Diffraction
+			</para>
+</section>
+</section>
+<section id="sect-Wireless_Guide-Communication-Data_Rates_and_Throughput">
 <title>Data Rates and Throughput</title>
 			<para>
 				Several metrics and measurements are used to define elements of a WLAN, such as data rate, throughput, signal to noise ratio (SNR), antenna gain, signal loss and encryption strength. One commonly misunderstood concept is the relationship between <emphasis>data rate</emphasis> and <emphasis>throughput</emphasis>.
@@ -16,19 +52,19 @@
 				The full 54Mbps throughput as defined in the standard can never be achieved in the real world. Your actual throughput of network data is typically 15% to 40% of this marketed level. <emphasis>Data rate</emphasis> is the negotiated, variable, maximum possible link to other devices, and <emphasis>throughput</emphasis> is the real-world, measured amount of actual data flow.
 			</para>
 </section>
-<section id="sect-Wireless_Guide-Hardware-Dynamic_Rate_Switching">
+<section id="sect-Wireless_Guide-Communication-Dynamic_Rate_Switching">
 <title>Dynamic Rate Switching</title>
 			<para>
 				Continuing to use the IEEE 802.11g standard to define these terms, a wireless client is capable of negotiating its connection with other devices at several different <emphasis>data rates</emphasis>. This ability to change data rates is known as <command>Dynamic Rate Switching</command>, and a properly functioning client will be able to negotiate the best possible, theoretical speed depending on the distance from the Access Point, the amount and type of other devices that are connecting, and overall environmental conditions.  The IEEE 802.11g standard can operate under the following data rates: 6, 9, 12, 18, 24, 36, 48 and 54 Mbps, and can use 802.11b data rates if in a mixed-mode environment. 
 			</para>
 </section>
-<section id="sect-Wireless_Guide-Hardware-Received_Signal_Strength_Indicator">
+<section id="sect-Wireless_Guide-Communication-Received_Signal_Strength_Indicator">
 <title>Received Signal Strength Indicator</title>
 			<para>
 The series of speeds used in Dynamic Rate Switching, and the current connected rate, are usually displayed in your operating system, perhaps as a graph or series of bars, or other explanatory text giving you an idea of your signal strength. This is known as the <command>Received Signal Strength Indicator</command> (RSSI). The RSSI can be very useful in determining signal strength, however there is no specification in the IEEE standards of how the RSSI should present its information, or even interpret the wireless information. Because of this, the RSSI tools can differ greatly between different operating systems. Any information presented to you by the RSSI should be evaluated with this point in mind.
 			</para>
 </section>
-<section id="sect-Wireless_Guide-Hardware-Connection_Modes">
+<section id="sect-Wireless_Guide-Communication-Connection_Modes">
 <title>Connection Modes</title>
 			<para>
 				Clients typically connect in one of two modes: <emphasis>adhoc</emphasis> or <emphasis>infrastructure</emphasis>. Adhoc mode involves stations communicating directly with each other without the need for a central point to manage communications. This is also known as peer-to-peer mode. The default and most common mode is known as Infrastructure mode. Infrastructure mode uses a Wireless Access Point (WAP), which is a central device that manages transmissions between clients. Refer to the following for more details on Access Points:
@@ -47,7 +83,7 @@
 			</para>
 					
 </section>
-<section id="sect-Wireless_Guide-Hardware-Channels">
+<section id="sect-Wireless_Guide-Communication-Channels">
 <title>Channels</title>
 			<para>
 				802.11b and 802.11g (the most common) devices are usually referred to as operating at 2.4GHz (gigahertz). In fact, the signals for these devices can operate on one of eleven (11) distinct channels within the 2.4GHz band. Some regions allow operation in thirteen (13) channels, however the U.S FCC defines eleven (11) channels. What this means is that you can configure your wireless adapter and access point to operate on slightly different frequencies than other networks in your area, to avoid interference and congestion. Each of these channels cover a frequency range of 22MHz; in other words, a device operating in each of these channels can operate at up to 11MHz on either side of the "center" frequencies listed in the following table.